Open Paleo

Eocarcharia

Sereno & Brusatte, 2008 EE-o-car-CAR-ee-uh

From Greek eos, 'dawn/early', + Greek karcharias, 'shark' (as in a sharp-toothed creature); means 'dawn shark', referring to its early geological age and shark-like serrated teeth

121.4–100.5 million years ago Aptian–Albian, Early Cretaceous
Early Cretaceous stages

Eocarcharia is an extinct genus of theropod dinosaurs found in what is now the western Ténéré Desert of Niger. It is known from several skull bones collected in 2000 by an expedition to the Early Cretaceous (Aptian-Albian ages) Elrhaz Formation (Gadoufaoua locality) led by American paleontologist Paul Sereno. The fossil material was then described in 2008 by Sereno and Steve Brusatte. The genus contains a single species, Eocarcharia dinops. While Sereno and Brusatte identified all of the remains as belonging to a new carcharodontosaurid, later studies suggested that the species is chimeric, comprising bones of at least two unrelated taxa. Some of the Eocarcharia material, including the holotype (name-bearing) specimen, likely belongs to a baryonychine spinosaurid. This would render Eocarcharia a member of this group, closely related to the coeval Suchomimus. Meanwhile, the definitively carcharodontosaurid bones, a maxilla and teeth, belong to a distinct unnamed taxon.

Under dispute

Eocarcharia dinops is regarded as a basal carcharodontosaurid on the basis of its referred maxilla (Sereno and Brusatte, 2008), but Cau and Paterna (2025) argue the hypodigm is chimeric, reinterpreting the holotype postorbital as a spinosaurid (Baryonychinae) and severing it from the carcharodontosaurid maxilla. It is placed conservatively at Carcharodontosauridae incertae sedis.

Diagnosis

  1. Enlarged subtriangular laterally exposed promaxillary fenestra larger in size than the maxillary fenestra
  2. Circular accessory pneumatic fenestra on the posterodorsal ramus of the maxilla
  3. Dorsoventral expansion of antorbital fossa ventral to the promaxillary and maxillary fenestrae
  4. Postorbital brow accentuated by a finely textured ovoid swelling (boss) positioned above the posterodorsal corner of the orbit
  5. Postorbital medial process with a plate-shaped projection fitted to an articular slot on the frontal
  6. Interlocking postorbital-jugal articulation with a narrow laterally-facing facet where jugal wraps around posterior margin of postorbital ventral ramus

Species

Eocarcharia dinops Sereno & Brusatte, 2008

Type species

From Ancient Greek 'dinops' meaning 'fierce-eyed', referring to the distinctive postorbital ornamentation above the eye socket.

Holotype
MNBH GAD2 , Musée National Boubou Hama
Material
Postorbital (skull bone behind the orbit)
Horizon
Elrhaz Formation, Aptian–Albian, Early Cretaceous , 121.4–100.5 million years ago
Locality
Gadoufaoua, G138, Agadez, Niger

References

  1. Sereno, P. C.; Brusatte, S. L. (2008). Basal Abelisaurid and Carcharodontosaurid Theropods from the Lower Cretaceous Elrhaz Formation of Niger. Acta Palaeontologica Polonica 53(1): 15-46. Polska Akademia Nauk Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences). doi:10.4202/app.2008.0102 sereno2008a
  2. Jones, B. (2026). The Princeton Encyclopedia of Dinosaurs: Theropods. Princeton University Press.

    Source of the mass and hip height estimates, and the appearance features.

    jones2026c
  3. Cau, A.; Paterna, A. (2025). Beyond the Stromer's Riddle: the impact of lumping and splitting hypotheses on the systematics of the giant predatory dinosaurs from northern Africa. Italian Journal of Geosciences 144(2): 162-185. doi:10.3301/IJG.2025.10

    Argued the Eocarcharia hypodigm is chimeric, reinterpreting the holotype postorbital as a spinosaurid.

    cau2025a